Cortexin vs DSIP
A neutral, side-by-side comparison of two nootropic & cognitive peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.
Cortexin
Polypeptide nootropic extracted from the cortex of cattle or pigs, containing a mixture of low-molecular-weight neuropeptides (≤10 kDa). Registered pharmaceutical in Russia and widely used in Eastern European clinical medicine for stroke recovery, traumatic brain injury, cognitive decline, epilepsy, and cerebrovascular disease. Decades of Russian clinical literature support neuroprotective and neurorestorative effects.
Full profileDSIP
DSIP (Delta Sleep Inducing Peptide) is a nonapeptide (9 amino acids) first isolated from rabbit thalamus in 1974, initially believed to directly induce slow-wave (delta) sleep. Research has since broadened its profile considerably: it modulates the HPA axis (reducing stress-driven cortisol), influences GH and LH release, demonstrates antioxidant properties, and may have cardioprotective effects. Despite decades of research, its precise receptor system remains incompletely characterized.
Full profile| Cortexin | DSIP | |
|---|---|---|
| Category | Nootropic & Cognitive | Nootropic & Cognitive |
| Also known as | cortexin polypeptide, cortexin-10, neuropeptide bioregulator, cortexin-5 | Delta Sleep Inducing Peptide, Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu |
| Evidence | Research-stage | Research-stage |
| Dosing range | 5mg–20mg mg, daily IM injection for 10-day courses | 100mcg–500mcg mcg, Once daily (evening) or every other day |
| Administration | Intramuscular injection | Subcutaneous injection, Intranasal, Intravenous (clinical studies) |
| Key side effects | Injection site pain, Rare allergic reaction, Headache (transient), Mild dizziness | Generally well-tolerated, Daytime drowsiness if dosed in morning, Mild headache, Altered dream quality (common) |
| Cited sources | 2 references | 3 references |
Key differences
- Administration: Cortexin — Intramuscular injection; DSIP — Subcutaneous injection, Intranasal, Intravenous (clinical studies).
- Dosing units differ: Cortexin is dosed in mg, DSIP in mcg — they operate at different scales.
- Frequency: Cortexin is typically daily IM injection for 10-day courses; DSIP is Once daily (evening) or every other day.
- Research depth: this profile cites 2 sources for Cortexin vs 3 for DSIP.
How each works
Cortexin
Cortexin's multi-component neuropeptide mixture modulates neurotransmitter systems, improves cerebral blood flow, enhances neuroplasticity (BDNF upregulation), and exhibits antioxidant and anti-apoptotic activity in neuronal tissue. Russian stroke rehabilitation trials show improved neurological deficit scores and functional recovery with 10-day cortexin courses compared to standard care alone. The mechanism involves multiple parallel neuropeptide signaling pathways.
DSIP
DSIP does not directly trigger sleep in the simple sense originally proposed — more recent research indicates it modulates the neuroendocrine environment that facilitates sleep. Key findings: it reduces ACTH-driven cortisol elevation under stress, increases GH secretion in some models, and attenuates withdrawal severity in opioid and alcohol dependence (mechanisms unclear). DSIP demonstrates antioxidant effects and has cardioprotective properties in ischemic preconditioning models in animals. Its unique resistance to most peptidases (attributed to its unusual conformation) gives it a relatively long half-life for a nonapeptide.
This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.